The job cuts could affect thousands of staff, according to a source familiar with the situation who was not authorized to speak publicly. Executives are also likely to announce senior management changes by email, the source said.

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Preparations for Monday's announcements were communicated verbally in meetings, according to a source familiar with the situation who was not authorized to speak publicly. Some staff may be able to apply for other roles at the bank, the source said.

Citigroup declined to comment.

Last month, Citi announced plans to cut management layers from 13 to eight as part of its biggest overhaul in decades. In the two top layers of leadership, Citi reduced 15% of functional roles and eliminated 60 committees, it said in its third-quarter earnings presentation.

Support staff in compliance and risk management, and technology staff working on overlapping functions are at risk of being laid off, Reuters reported in September.

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As part of the reshuffle, the US bank will name one of its most senior bankers in Europe, Nacho Gutiérrez-Orrantia, new head of banking in the region, according to people familiar with the situation.

In his new role of head of the Europe cluster, the Spanish banker will look after Citi´s businesses in Europe.